Abstract: The disclosure relates to a roller crusher including a first grinding roll and a second grinding roll, the first and second grinding rolls being arranged generally in parallel to each other and to define a crushing gap therebetween and drivable in a counter-rotating manner. The roller crusher includes a device of a first type for loosening granular material present on a crushing surface of at least one of the rolls, the device including at least one rotatable disc element. The subject further relates to a roller crusher, wherein the plurality of disc elements is individually rotatable.

Abstract: An apparatus for pushing a hose along a conduit includes a rotatable reel, a hose wound on the reel, and a driving arrangement for drawing the hose off the reel and for pushing the hose into and along a conduit. The apparatus can also include an arrangement attached to a leading end of the hose for permitting the leading end of the hose to roll along the interior surface of the conduit. Also, a guide can be positioned in the access opening to the conduit in order to permit the hose to move more easily through sharp turns.